Station-orientation catalog for Australian broadband seismic stations

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Authors

Kotaro Tarumi, Kazunori Yoshizawa

Abstract

gations in and around Australia. Although two horizontal components are generally assumed to be oriented in the north and east directions, as reported by data providers, misorientations of horizontal components from the true geographic north direction cannot be avoided in practical field observations, even in the well-maintained permanent stations. In this report, we applied a polarization analysis to almost all stations in Australia to estimate the misorientations of horizontal components using long-period teleseismic P-waves. A large data set of P-wave arrival angles allows us to successfully detect probable horizontal misorientations, including significant temporal changes in some stations, which generally happened at reported timings of station maintenance and instrument replacements. However, some stations exhibit misorientations and temporal changes at unexpected timings that are unreported. Compiling the information on such time-dependent misorientations, we created a full catalog of horizontal-component orientations for both permanent and temporary stations in Australia, which are widely available for the community.

DOI

https://doi.org/10.31223/X5DQ58

Subjects

Earth Sciences

Keywords

body waves, station orientation, receiver functions

Dates

Published: 2024-10-26 02:15

Last Updated: 2024-10-26 09:15

License

CC BY Attribution 4.0 International